Shiny Droplets are small AppleScript-based applications that integrate with the Finder toolbar to provide fast shortcuts to text editors and other applications.

Mac OS X has a built-in command line utility called osascript that can read and execute AppleScript files or execute AppleScript commands passed as an argument.

Using AppleScript and the scselect command line utility, it’s possible to build an application that will toggle the system between Network Locations when run.

Growl is a Mac OS X add-on that allows applications or scripts to display messages in a fading notification box, as spoken text, or as an email.

OS X has PDF printing support built-in, and a Terminal command or AppleScript can convert virtually any kind of document to the PDF format.